From a7a7875e3c95b18488d240cca2130fd089ce39d3 Mon Sep 17 00:00:00 2001
From: Rufina Uche <102101377+Finniki@users.noreply.github.com>
Date: Fri, 18 Aug 2023 20:43:41 +0100
Subject: [PATCH] Calculating the Sum of Two Arrays Element by Element in Java
 (#14579)

* Create SumArraysUsingForLoop.java

* Update SumArraysUsingForLoop.java

* add sum arrays using for each loop and streams

* Create SumArraysUsingForLoopTest.java

* Add files via upload

* Update SumArraysUsingStreams.java

* Update and rename SumArraysUsingForEachTest.java to SumArraysUsingForEachUnitTest.java

* Rename SumArraysUsingForLoopTest.java to SumArraysUsingForLoopUnitTest.java

* Update and rename SumArraysUsingStreamsTest.java to SumArraysUsingStreamsUnitTest.java

* Update SumArraysUsingForEachUnitTest.java

* Update SumArraysUsingForLoopUnitTest.java

* Update SumArraysUsingForEachUnitTest.java

* Update SumArraysUsingStreamsUnitTest.java
---
 .../arraysums/SumArraysUsingForEach.java         | 14 ++++++++++++++
 .../arraysums/SumArraysUsingForLoop.java         | 12 ++++++++++++
 .../arraysums/SumArraysUsingStreams.java         | 14 ++++++++++++++
 .../arraysums/SumArraysUsingForEachUnitTest.java | 16 ++++++++++++++++
 .../arraysums/SumArraysUsingForLoopUnitTest.java | 16 ++++++++++++++++
 .../arraysums/SumArraysUsingStreamsUnitTest.java | 16 ++++++++++++++++
 6 files changed, 88 insertions(+)
 create mode 100644 core-java-modules/core-java-arrays-operations-advanced/src/main/java/com/baeldung/arraysums/SumArraysUsingForEach.java
 create mode 100644 core-java-modules/core-java-arrays-operations-advanced/src/main/java/com/baeldung/arraysums/SumArraysUsingForLoop.java
 create mode 100644 core-java-modules/core-java-arrays-operations-advanced/src/main/java/com/baeldung/arraysums/SumArraysUsingStreams.java
 create mode 100644 core-java-modules/core-java-arrays-operations-advanced/src/test/java/com/baeldung/arraysums/SumArraysUsingForEachUnitTest.java
 create mode 100644 core-java-modules/core-java-arrays-operations-advanced/src/test/java/com/baeldung/arraysums/SumArraysUsingForLoopUnitTest.java
 create mode 100644 core-java-modules/core-java-arrays-operations-advanced/src/test/java/com/baeldung/arraysums/SumArraysUsingStreamsUnitTest.java

diff --git a/core-java-modules/core-java-arrays-operations-advanced/src/main/java/com/baeldung/arraysums/SumArraysUsingForEach.java b/core-java-modules/core-java-arrays-operations-advanced/src/main/java/com/baeldung/arraysums/SumArraysUsingForEach.java
new file mode 100644
index 0000000000..3c2a75a409
--- /dev/null
+++ b/core-java-modules/core-java-arrays-operations-advanced/src/main/java/com/baeldung/arraysums/SumArraysUsingForEach.java
@@ -0,0 +1,14 @@
+package com.baeldung.arraysums;
+
+public class SumArraysUsingForEach {
+
+    public static int[] sumOfTwoArrays(int[] arr1, int[] arr2) {
+        int[] arr3 = new int[arr1.length];
+        int counter = 0;
+        for (int num1 : arr1) {
+            arr3[counter] = num1 + arr2[counter];
+            counter++;
+        }
+        return arr3;
+    }
+}
diff --git a/core-java-modules/core-java-arrays-operations-advanced/src/main/java/com/baeldung/arraysums/SumArraysUsingForLoop.java b/core-java-modules/core-java-arrays-operations-advanced/src/main/java/com/baeldung/arraysums/SumArraysUsingForLoop.java
new file mode 100644
index 0000000000..32e2e939d4
--- /dev/null
+++ b/core-java-modules/core-java-arrays-operations-advanced/src/main/java/com/baeldung/arraysums/SumArraysUsingForLoop.java
@@ -0,0 +1,12 @@
+package com.baeldung.arraysums;
+
+public class SumArraysUsingForLoop {
+
+    public static int[] sumOfTwoArrays(int[] arr1, int[] arr2) {
+        int[] arr3 = new int[arr1.length];
+        for (int i = 0; i < arr1.length; i++) {
+            arr3[i] = arr1[i] + arr2[i];
+        }
+        return arr3;
+    }
+}
diff --git a/core-java-modules/core-java-arrays-operations-advanced/src/main/java/com/baeldung/arraysums/SumArraysUsingStreams.java b/core-java-modules/core-java-arrays-operations-advanced/src/main/java/com/baeldung/arraysums/SumArraysUsingStreams.java
new file mode 100644
index 0000000000..40bfda4b74
--- /dev/null
+++ b/core-java-modules/core-java-arrays-operations-advanced/src/main/java/com/baeldung/arraysums/SumArraysUsingStreams.java
@@ -0,0 +1,14 @@
+package com.baeldung.arraysums;
+
+import java.util.Arrays;
+import java.util.stream.IntStream;
+
+public class SumArraysUsingStreams {
+
+    public static int[] sumOfTwoArrays(int[] arr1, int[] arr2) {
+        IntStream range = IntStream.range(0, Math.min(arr1.length, arr2.length));
+        IntStream stream3 = range.map(i -> arr1[i] + arr2[i]);
+        int[] arr3 = stream3.toArray();
+        return arr3;
+    }
+}
diff --git a/core-java-modules/core-java-arrays-operations-advanced/src/test/java/com/baeldung/arraysums/SumArraysUsingForEachUnitTest.java b/core-java-modules/core-java-arrays-operations-advanced/src/test/java/com/baeldung/arraysums/SumArraysUsingForEachUnitTest.java
new file mode 100644
index 0000000000..883b35b223
--- /dev/null
+++ b/core-java-modules/core-java-arrays-operations-advanced/src/test/java/com/baeldung/arraysums/SumArraysUsingForEachUnitTest.java
@@ -0,0 +1,16 @@
+package com.baeldung.arraysums;
+
+import com.baeldung.arraysums.SumArraysUsingForEach;
+import org.junit.Test;
+import static org.junit.Assert.*;
+
+public class SumArraysUsingForEachUnitTest {
+
+    @Test
+    public void sumOfTwoArraysUsingForEach_GivenTwoEqualSizedIntArrays_ReturnsCorrectSumArray() {
+        int[] arr1 = { 4, 5, 1, 6, 4, 15 };
+        int[] arr2 = { 3, 5, 6, 1, 9, 6 };
+        int[] expected = { 7, 10, 7, 7, 13, 21 };
+        assertArrayEquals(expected, SumArraysUsingForEach.sumOfTwoArrays(arr1, arr2));
+    }
+}
diff --git a/core-java-modules/core-java-arrays-operations-advanced/src/test/java/com/baeldung/arraysums/SumArraysUsingForLoopUnitTest.java b/core-java-modules/core-java-arrays-operations-advanced/src/test/java/com/baeldung/arraysums/SumArraysUsingForLoopUnitTest.java
new file mode 100644
index 0000000000..7cffd5f4ff
--- /dev/null
+++ b/core-java-modules/core-java-arrays-operations-advanced/src/test/java/com/baeldung/arraysums/SumArraysUsingForLoopUnitTest.java
@@ -0,0 +1,16 @@
+package com.baeldung.arraysums;
+
+import com.baeldung.arraysums.SumArraysUsingForLoop;
+import org.junit.Test;
+import static org.junit.Assert.*;
+
+public class SumArraysUsingForLoopUnitTest {
+
+    @Test
+    public void sumOfTwoArrays_GivenTwoEqualSizedIntArrays_ReturnsCorrectSumArray() {
+        int[] arr1 = {4, 5, 1, 6, 4, 15};
+        int[] arr2 = {3, 5, 6, 1, 9, 6};
+        int[] expected = {7, 10, 7, 7, 13, 21};
+        assertArrayEquals(expected, SumArraysUsingForLoop.sumOfTwoArrays(arr1, arr2));
+    }
+}
diff --git a/core-java-modules/core-java-arrays-operations-advanced/src/test/java/com/baeldung/arraysums/SumArraysUsingStreamsUnitTest.java b/core-java-modules/core-java-arrays-operations-advanced/src/test/java/com/baeldung/arraysums/SumArraysUsingStreamsUnitTest.java
new file mode 100644
index 0000000000..62ea465ab0
--- /dev/null
+++ b/core-java-modules/core-java-arrays-operations-advanced/src/test/java/com/baeldung/arraysums/SumArraysUsingStreamsUnitTest.java
@@ -0,0 +1,16 @@
+package com.baeldung.arraysums;
+
+import com.baeldung.arraysums.SumArraysUsingStreams;
+import org.junit.Test;
+import static org.junit.Assert.*;
+
+public class SumArraysUsingStreamsUnitTest {
+
+    @Test
+    public void sumOfTwoArraysUsingStreams_GivenTwoEqualSizedIntArrays_ReturnsCorrectSumArray() {
+        int[] arr1 = {4, 5, 1, 6, 4, 15};
+        int[] arr2 = {3, 5, 6, 1, 9, 6};
+        int[] expected = {7, 10, 7, 7, 13, 21};
+        assertArrayEquals(expected, SumArraysUsingStreams.sumOfTwoArrays(arr1, arr2));
+    }
+}